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WorksheetsTICE Lab Quiz 2025
Total questions: 50
Worksheet time: 17mins
Flash point is defined as:
Lowest temperature at which oil catches fire and burns for 5 s
Lowest temperature at which vapours ignite momentarily
Highest temperature of ignition
Temperature of decomposition
Fire point is:
Always lower than flash point
Always higher than flash point
Equal to flash point
Unrelated to flash point
Pensky–Martens apparatus uses:
Open cup only
Closed cup only
Both open and closed cup
Redwood viscometer cup
Flash point indicates the presence of:
Heavy impurities
Moisture
Volatile substances
Carbon particles
Flash point is used mainly for:
Density estimation
Safety classification
Viscosity prediction
Calorific value estimation
A good lubricant should have flash point:
Below operating temperature
Equal to operating temperature
Above operating temperature
Unrelated to operating temperature
Ignition source used in Pensky–Martens is:
Electric spark
Gas flame or hot wire
UV lamp
Laser flame
Boy’s gas calorimeter determines:
HCV only
LCV only
Both HCV and LCV (if condensation works)
Density
Pertaining to Boy's calorimeter, The heat gained by water =
Mass × Cp × ΔT
Mass × Cv × ΔT
Cp × Cv
ΔT / Cp
LPG vapour is ______ than air.
Lighter
Heavier
Same density
Depends on temperature
Unit of calorific value for gases is usually:
kJ/kg
J/m³
kJ/m³
kcal/kg
LPG composition mainly contains:
Methane only
Propane and butane
Ethane
Hydrogen
In Boy's calorimeter experiment, Correct sequence of energy balance:
Heat gained = Heat lost
Heat released by gas = Heat gained by water
Heat released by gas = Heat lost by water
No heat transfer
In boys calorimeter experiment the Ideal color of flame during test is:
Yellow
Red
Blue
White
Calorific value increases when:
Combustion is incomplete
Water flow is unstable
Temperature rise increases
Gas pressure decreases
1 calorie equals:
2.1 J
4.186 J
1 J
10 J
Valve overlap occurs when:
Both valves closed
Both valves open
Only inlet open
Only exhaust open
Inlet valve typically opens:
At TDC
Before TDC
After TDC
At BDC
Exhaust valve closes:
Exactly at TDC
Before TDC
After TDC
Before BDC
Purpose of exhaust valve lead is:
Reduce pumping loss
Increase friction
Reduce scavenging
Lower compression
Purpose of exhaust valve lead is:
Reduce pumping loss
Increase friction
Reduce scavenging
Lower compression
Valve timing is measured in:
Radians
Degrees of crank angle
Degrees of cam angle
Linear displacement
Brake power is measured using:
Thermometer
Tachometer
Dynamometer
Manometer
Brake power formula is:
BP = 2πNT
BP = πNT
BP = NT
BP = 4πNT
Rope brake load is computed as:
W + S
W − S
S − W
W × S
Mechanical efficiency =
BP/IP
IP/BP
IP × BP
1 − BP/IP
DC generator gives direct measurement of:
Torque
Load current and voltage
Pressure
Temperature
Electrical output =
V/I
VI
V/I²
V²/I
Generator loading affects:
Speed
Temperature
All performance parameters
Only torque
Indicated power is always:
Less than brake power
Greater than brake power
Equal to brake power
Unrelated
Major heat losses occur to:
Exhaust
Cooling water
Friction
All of these
A typical diesel engine has thermal efficiency about:
10–15%
20–25%
30–35%
70%
Petrol engine works on:
Diesel cycle
Otto cycle
Dual cycle
Brayton cycle
Spark plug is required because:
Compression ratio is high
Fuel auto-ignites
Fuel does not auto-ignite
Engine is cold
Performance parameter measured is:
Only torque
Only fuel consumption
Torque, speed, fuel, air
Temperature only
Compression ratio can be varied by:
Changing carburetor
Changing piston clearance
Changing load
Changing ignition timing
Higher compression ratio increases:
Thermal efficiency
BSFC
Friction only
No effect
Too high compression in petrol engine leads to:
Knocking
Misfiring
Starting trouble
Overcooling
Purpose of intercooling is to:
Increase temperature
Reduce work input
Increase pressure ratio
Reduce lubrication
Work input is minimum when compression is:
Isothermal
Adiabatic
Polytropic
Hyperbolic
Gas calorimeter: Water flows at 12 kg/hr and temperature rises by 18 °C. Gas consumption = 0.03 m³/min.
Find LCV (kJ/m³). Use Cp = 4.18 kJ/kgK.
15000
18000
25000
30000
A rope brake dynamometer uses brake drum radius 0.15 m, load W = 42 N, spring balance S = 12 N, speed = 1000 rpm.
Find brake power.
0. 471 kW
1.89 kW
2.0 kW
2.2 kW
A DC generator gives 220 V and 12 A. If engine speed is 1500 rpm, calculate brake power. Efficiency of generator = 85%.
3.1 kW
2.2 kW
3.0 kW
2.5 kW
A petrol engine consumes 0.6 kg of fuel in 10 minutes at speed of 3000 rpm while delivering 6 kW. Find BSFC (kg/kWh).
0.5
0.6
0.4
0.3
A two-stage compressor takes in 0.1 m³ of air at 1 bar. After compression to 9 bar, the ideal intercooler drops temperature back to initial (isothermal). Find work ratio (W_actual / W_isothermal) assuming polytropic index n=1.3.
1.2
1.5
1.7
2.0
In a VCR engine test, compression ratio changes from 6 to 9. If efficiency (η) for Otto cycle = 1 − 1/(r^(γ−1)), with γ = 1.4.
Find increase in efficiency.
4%
6%
7%
10%
Water flows at 0.08 kg/s through calorimeter. Temperature rise = 25 °C. Heating value of fuel gas = 45 MJ/kg.
If fuel consumption = 0.04 kg/min, find thermal efficiency.
15%
20%
30%
40%
A machine delivers a torque of 120 N·m at a shaft speed of 1800 rpm.
Find the brake power in kW.
20.0 kW
21.5 kW
22.62 kW
24.5 kW
During valve timing measurement the inlet valve opens at 12° before TDC (IVO = 12° BTDC) and the exhaust valve closes at 8° after TDC (EVC = 8° ATDC).
What is the valve overlap (in degrees)?
4°
12°
20°
32°
Water flow through the calorimeter = 2.0 kg/min, water temperature rise ΔT = 30 °C.
Gas consumption = 0.02 m³/min. Take Cp=4.186C_p = 4.186Cp=4.186 kJ/kg·K.
Estimate the (lower) calorific value in kJ/m³.
6,279 kJ/m³
12,558 kJ/m³
12,5580 kJ/m³
31,740 kJ/m³
